Ditto ladyjrnlist's point. Tinnitus can be brought on by all sorts of things, including meds interfering with the brain and/or auditory nerve. The experience can range from deep rumbling sounds to mid range buzzing to high pitched hissing. Sometimes I am aware of several tones at the same time, but most often it is a high pitched hiss or ring. I live with it constantly now. Nip it in the bud as soon as you can before it becomes irreversible.